Protocol 1 uses the method of limits to estimate the value of sound pressure of a tone that can just be heard (threshold). In this method, a tone of varying intensity is presented and the listener must say whether he/she "heard" it. Tone intensities are either systematically decreased (descending limits) or systematically increased (ascending limits) from presentation to presentation.

In descending limits the tone is initially well above the subject's threshold and then the level is decreased until the subject responds "No" to the question, "Do you hear the tone?" The descending threshold is taken to be the level at which the responses change from "Yes" to "No". In ascending limits the tone is initially well below the subject's threshold and then increased until the subject responds "Yes" to to the question, "Do you hear the tone?".

Protocol 1 runs a descending limits test followed by an ascending limits test.

Instructions

Enter the parameters in the fields below, then click Begin.


Parameters
Ear      Results

Hz - Tone Frequency
dB SPL - Initial Tone Level
dB SPL - Noise Level
ms Tone Initial Pause
ms - Tone Rise Time
ms - Tone On Time
ms - Tone Fall Time
ms - Noise Initial Pause
ms - Noise Rise Time
ms - Noise On Time
ms - Noise Fall Time
Hz - Noise High-Pass Frequency
Hz - Noise Low-Pass Frequency
dB - Step Size
Hz - Sample Rate      dB SPL - Calibration